667118623 has 4 divisors (see below), whose sum is σ = 671988240. Its totient is φ = 662249008.

The previous prime is 667118563. The next prime is 667118629. The reversal of 667118623 is 326811766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667118623 - 2¹⁷ = 666987551 is a prime.

It is a super-2 number, since 2×667118623² = 890094514306832258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667118629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2434603 + ... + 2434876.

It is an arithmetic number, because the mean of its divisors is an integer number (167997060).

Almost surely, 2^667118623 is an apocalyptic number.

667118623 is a deficient number, since it is larger than the sum of its proper divisors (4869617).

667118623 is a wasteful number, since it uses less digits than its factorization.

667118623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869616.

The product of its digits is 72576, while the sum is 40.

The square root of 667118623 is about 25828.6395886427. The cubic root of 667118623 is about 873.7778302546. Note that the first 3 decimals are identical.

The spelling of 667118623 in words is "six hundred sixty-seven million, one hundred eighteen thousand, six hundred twenty-three".